Rajan Wilcox
If you're experiencing issues with your Stihl backpack blower, such as loss of power or difficulty in starting, it may be due to a clogged fuel tank vent. The fuel tank vent is responsible for allowing air to enter the tank and preventing a vacuum from forming, which can disrupt the flow of fuel to the carburetor. To clean the fuel tank vent, you may need to remove or replace the vent, which is usually located on top of the tank, and ensure that all holes are clear and unobstructed. This can often resolve issues with the blower's performance and ensure efficient fuel flow.
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What You'll Learn
Why does the fuel tank vent suck air in, not blow out?
The fuel tank vent in a Stihl backpack blower is designed to suck air in rather than blow out. This is because the vent acts as a check valve, allowing pressure to escape from the tank while also preventing a vacuum from forming. By sucking air in, the vent helps to equalize the pressure inside the fuel tank and ensures that the blower can operate effectively.
When the fuel tank vent is functioning correctly, it allows air to enter the tank as fuel is consumed, preventing a vacuum from forming and ensuring a steady flow of fuel to the engine. This is crucial for the blower's performance, as a vacuum or negative pressure can disrupt the fuel delivery system and lead to engine performance issues.
Additionally, the vent's ability to suck air in helps to compensate for changes in atmospheric pressure and temperature, which can affect the pressure inside the fuel tank. By allowing air to enter, the vent helps to maintain a balanced pressure, ensuring that the blower can be started and operated without difficulty.
While the primary function of the fuel tank vent is to allow air to enter the tank, it is also designed to prevent fuel leakage. In some cases, if the vent becomes damaged or faulty, it may allow fuel to escape. Therefore, it is essential to regularly inspect and maintain the fuel tank vent to ensure its proper functioning and prevent any potential issues.
Overall, the fuel tank vent's ability to suck air in is essential for the Stihl backpack blower's performance and fuel delivery system. By equalizing pressure and preventing a vacuum, the vent ensures that the engine receives an uninterrupted supply of fuel, enabling the blower to operate efficiently and consistently.
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How to clean the holes in the tank vent
To clean the holes in the tank vent of a Stihl backpack blower, you will need to first locate the vent. The vent is typically located on the top of the fuel tank, and it may be covered by a plastic circle with holes or a cap.
Once you have located the vent, use a screwdriver to gently pry off the plastic cover or remove the cap. If the vent is clogged, you may need to use a small brush or compressed air to clear away any debris or buildup. Soak the vent in a penetrating lubricant for a minute to help loosen any stubborn debris.
It's important to note that the fuel tank vent should allow air to flow into the tank, not out. If the vent is blocked, it can create a vacuum in the tank, which will affect the engine's performance. In some cases, it may be necessary to replace the vent or the entire fuel tank if cleaning does not resolve the issue.
Additionally, it is recommended to consult the product manual or seek advice from a qualified technician if you are unsure about any aspect of cleaning or maintaining your Stihl backpack blower.
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How to identify the correct replacement vent
To identify the correct replacement vent for your Stihl backpack blower, you will need to determine the specific model of your blower, as different models may have different compatible vents. Here is a step-by-step guide to help you identify the correct replacement vent:
- Identify the model number of your Stihl backpack blower. The model number is usually located on a sticker or plate on the blower itself. Common models include the MS260, MS360, MS362, and BR600.
- Once you have the model number, you can search for compatible replacement vents online. There are several online retailers and parts lookup tools that can help you find the correct part for your specific model.
- When searching for a replacement vent, pay attention to the part number. The part number for the Stihl fuel tank vent is typically "0000 350 5800". This part number is compatible with several Stihl models, including the MS260, MS261, MS360, MS362, and BR600, as mentioned in several customer reviews.
- Some Stihl backpack blowers may have different versions of the fuel tank vent. Older versions may have an o-ring, while newer versions may have a grommet. The part number for the vent with an o-ring is "0000-350-5800", and the part number for the vent with a grommet is "4203-350-5801". Ensure that you select the correct part number based on the version of your blower.
- It is also important to consider the physical characteristics of the vent. The fuel tank vent is typically a small, black component located on top of the fuel tank, to the left of and behind the gas cap. It may have a series of holes to allow ventilation.
- Before purchasing a replacement vent, it is recommended to refer to the official Stihl website or authorized service centres for accurate and up-to-date information on compatible parts for your specific model. They can provide detailed specifications and part numbers to ensure you obtain the correct replacement vent.
By following these steps and cross-referencing the model number, part number, and physical characteristics, you can identify the correct replacement vent for your Stihl backpack blower.
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Should the fuel tank vent be left open or closed?
When it comes to fuel tank vents, there are varying opinions on whether they should be left open or closed. Some people believe that it is better to leave the lid slightly open to allow the tank to breathe and prevent moisture build-up. On the other hand, others argue that closing the vent is essential to prevent fuel spillage and reduce the risk of ignition.
Leaving the Fuel Tank Vent Open:
Those who prefer to leave the fuel tank vent open argue that it is necessary for the engine to run efficiently. As fuel is drawn from the tank, air needs to enter the tank to replace the volume of the removed fuel. If the vent is closed, a vacuum can form, causing the engine to stall or shut off. Additionally, leaving the vent open slightly can help release fuel vapours, especially if the tank is left in direct sunlight or under a cover, preventing the build-up of pressure.
Closing the Fuel Tank Vent:
On the other hand, those who prefer to close the fuel tank vent argue that it is important to prevent fuel spillage. When the boat is in motion, the fuel can slosh around and escape through the vent if it is left open. Closing the vent also reduces the risk of fuel fumes igniting. Additionally, closing the vent can help prevent moisture and condensation from forming inside the tank, which could contaminate the fuel.
It is worth noting that some people with self-venting caps or portable gas tanks have reported no issues with fuel spillage or engine performance regardless of whether the vent is open or closed. However, for those with fuel tanks connected to an engine, it is generally recommended to keep the vent open to ensure proper airflow and engine performance.
In summary, whether to leave the fuel tank vent open or closed depends on various factors, including the type of fuel tank, the conditions it is stored in, and personal preferences. However, for engines connected to fuel tanks, it is generally advisable to keep the vent open to ensure proper airflow and prevent engine issues.
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What to do if the fuel tank vent doesn't fit
If the fuel tank vent doesn't fit, there could be a few reasons. Firstly, ensure that you have the correct part for your specific Stihl model. The fuel tank vent part number for many Stihl models is 0000 350 5800, but it is important to verify compatibility with your specific model. Check the manufacturer's instructions or consult a Stihl dealer to ensure you have the right part.
If you have confirmed you have the correct part, examine the vent and the fuel tank carefully. Look for any signs of damage or deformity that might prevent a secure fit. If the vent or the fuel tank is damaged, you may need to replace the affected component.
It is also possible that there is an obstruction preventing the vent from fitting properly. In some Stihl models, the fuel tank vent is located under the airbox cover. Try removing the airbox cover and checking for any debris or residue that might be blocking the vent area. Use a screwdriver to carefully pry out the vent, and if necessary, apply a penetrating lubricant around the edge to help loosen any buildup. Allow the lubricant to soak for a minute before attempting to remove the vent.
If the vent still doesn't fit securely, consider seeking professional assistance. A qualified technician familiar with Stihl equipment can inspect the fuel tank and vent to identify any issues and recommend the appropriate course of action. They can also guide you on proper installation techniques to ensure the vent is fitted correctly.
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Frequently asked questions
If your Stihl backpack blower starts and runs for a few minutes and then quits, it could be a sign that the fuel tank vent is clogged.
To clean your Stihl backpack blower's fuel tank vent, you will need to locate the vent, which is usually on top of the tank. Once located, you can try loosening the cap, cleaning or replacing the vent, or drilling a hole in the cap to create a vented cap.
A clogged fuel tank vent can cause the engine to shut down due to a vacuum created in the tank, preventing the carburetor from pulling the fuel. It can also lead to a build-up of pressure in the tank, which is a safety hazard.
If your Stihl backpack blower is not reaching full throttle or is losing power and stopping, it could be a sign that the fuel tank vent needs cleaning or replacement.
